A 6mm nodule is quite a small nodule and the smaller a nodule, the more likely it is to be benign. The overwhelming number of nodules this size are a residual of past infection and are of no consequence. Should you be concerned? The answer is, not at all concerned if you are under age 30 to 35 and a non-smoker. More concerned but not greatly concerned if you are a long time cigarette smoker and age 55 or older. Less concerned if you live in a geographical area where such post-fungal infection nodules are common such as the midwest and southwest.
Bottom line is that the assessment of a nodule must take into account many demographic factors, exposures, and physical characteristics of the nodule, in addition to size. Review of previous chest x-rays/CT scans for comparison is very important. Stability or lack of change of a nodule for 2 years or more is considered strong evidence of its being non-malignant.
You should discuss this with your doctor, for further clarification, but this nodule would generally be of little concern. If there is any doubt a CT scan limited to the area of the nodule in 6 months or so would be reasonable.
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